Record Case Detail

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 pwd: /out/package
ppid: 23321
   1: WRITELN echo 123 > 1.txt
   2: WRITELN echo 222 > 2.txt
   3: WRITELN echo 321 > 4.txt
   4: WRITELN cat < 1.txt 2.txt > 3.txt 4.txt
   5: WRITELN cat 1.txt
   6: WRITELN cat 2.txt
   7: WRITELN cat 3.txt
   8: WRITELN cat 4.txt
   9: WRITELN ls
  10: WRITELN exit

Your answer may be identical to the JOJ answer in the first several lines.

However, you will still get Wrong Answer because the complete output may be longer and there might be errors in the future lines.

Please double check your code to solve this problem and try again.

mumsh $ mumsh $ mumsh $ mumsh $ cat 1.txt
cat 2.txt
cat 3.txt
cat 4.txt
ls
exit
execvp failed: No such file or directory

=================================================================
==23327==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 72 byte(s) in 3 object(s) allocated from:
    #0 0x4dca90  (/out/package/mumsh_memory_check+0x4dca90)
    #1 0x516744  (/out/package/mumsh_memory_check+0x516744)
    #2 0x517b42  (/out/package/mumsh_memory_check+0x517b42)
    #3 0x7f77215bab96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 48 byte(s) in 3 object(s) allocated from:
    #0 0x4dca90  (/out/package/mumsh_memory_check+0x4dca90)
    #1 0x516c63  (/out/package/mumsh_memory_check+0x516c63)
    #2 0x517b42  (/out/package/mumsh_memory_check+0x517b42)
    #3 0x7f77215bab96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Direct leak of 48 byte(s) in 3 object(s) allocated from:
    #0 0x4dca90  (/out/package/mumsh_memory_check+0x4dca90)
    #1 0x516a5f  (/out/package/mumsh_memory_check+0x516a5f)

mumsh $ mumsh $ mumsh $ mumsh $ mumsh $ 123
mumsh $ 222
mumsh $ 222
321
mumsh $ 321
mumsh $ 1.txt
2.txt
3.txt
4.txt
driver
mumsh
mumsh_memory_check
mumsh $ exit

Notes

Stderr

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JOJ Answer